I just inserted a new 16 GB SD card in my AT&T Galaxy S5. I'm trying to format it but it's asking me for a pin and I don't know what it is its not the last 4 of my phone number and it's not my last 4 of my ssn. Please help!

  • 2
    please update your post along with the screen shot where exactly the device is asking the pin.
    – user285oo6
    Commented Oct 30, 2014 at 10:02

3 Answers 3


The fastest thing to do is to insert the 16GB SD Card into another phone, a digital camera, or a computer SD card reader, and format it there. You'll get the job done faster than any other way.

If for some reason you are set on using a pin, you can try 0000, which works in some cases.


The code you have to fill in is the last pin you used for your lock screen

  • Correct, it's the backup password you use if you're using the fingerprint scanner to unlock your device.
    – Marcel
    Commented May 18, 2016 at 23:47

New SD cards are not encrypted by default. If it is encrypted, look at the SD card's manual/white paper for details.
But more likely I think it is asking for mobile's password as you are trying to wipe off all the data from SD card.

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